Abstract: Device for controlling a locking system, of the type including a bolt (18) intended to restrict access to a confined space and comprising an electric power supply, a clock formed of a time base and a counter, to define a time reference, an electronic circuit including a microprocessor and a memory (32); and a key board for entering commands and data, particularly with the purpose of controlling the opening of the bolt. In order to avoid any manipulation of data relating to the intervention dates, the counter includes an incrementation input exclusively connected to the time base. In this way, the information recorded in the counter is only incremented by the time base and cannot be modified by a person.